Easier to use than a head that needs to be opened to fill. However, it doesn't work perfectly. The fishing line doesn't always pass through to the other side on the first try, a thin tool needs to be used to guide it out (a piece of wire...). Sometimes, when the fishing line is wrapped around the drum, it doesn't always go to the correct side, but because it gathers symmetrically on the drum, it hasn't caused any issues (at least not yet).
In any case, it is an upgrade from the classic head!